1.1 本试验方法包括快速测定热循环蒸汽冷凝液、除氧锅炉给水、锅炉水和除氧去离子水中的低水平（<100μg/L）溶解氧。颜色比较器可以估计0到100μg/L（ppb）氧气的浓度。 1.2 该试验方法可能适用于电子级、药物级和其他高纯度水，尽管这些在合作研究中没有涉及。 1.3 用户有责任确保本试验方法对未经试验基质的水的有效性。 1.4 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 溶解氧在某些锅炉和蒸汽循环中有害，因为它可能加速腐蚀。在许多高压锅炉系统中，浓度超过10μg/L是不可接受的。通过测量过程前后的浓度来确定通过化学或机械方法或两者结合从锅炉给水中去除溶解氧的效率。还进行了测量，以检查是否有空气泄漏到锅炉系统中。 5.2 减少锅炉腐蚀的氧气处理方法需要向锅炉给水中注入氧气。 出于控制目的，监测产生的氧气水平。

1.1 This test method covers the rapid determination of low-level (<100 μg/L) dissolved oxygen in thermal-cycle steam condensate, deaerated boiler feedwater, boiler water, and deaerated deionized water. Color comparators allow the estimation of concentrations ranging from 0 to 100 μg/L (ppb) oxygen. 1.2 This test method may be applicable to electronic-grade, pharmaceutical-grade, and other high-purity waters, although these were not addressed in the collaborative study. 1.3 It is the user’s responsibility to ensure the validity of this test method for waters of untested matrices. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Dissolved oxygen is detrimental in certain boiler and steam cycles because it may accelerate corrosion. Concentrations above 10 μg/L are unacceptable in many high-pressure boiler systems. The efficiency of dissolved oxygen removal from boiler feedwater by chemical or mechanical means, or both, is determined by measuring the concentration before and after the process. The measurement is also made to check for air leakage into the boiler system. 5.2 The oxygen treatment method for boiler corrosion reduction requires injection of oxygen into the boiler feedwater. The resulting oxygen level is monitored for control purposes.